<template>
    <div>
        <!-- 面包屑区域 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片式图 -->
        <el-card>
            <!-- 警示区 -->
            <el-alert title="注意：只能选中第三级分类" type="warning" :closable="false" show-icon></el-alert>
        
            <!-- 选择商品分类区 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 级联选择框 --->
                    <el-cascader
                    expand-trigger='hover'
                    v-model="selectdCateKeys"
                    :options="cateList"
                    :props="cateProps"
                    @change="handleChange" clearable></el-cascader>
                </el-col>
            </el-row>

            <!-- tab页签区 --->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!--- 添加动态参数面板 --->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible = true">添加参数</el-button>
                    <!--- 动态参数表格 --->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开行 --->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 --->
                            <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{ item }}</el-tag>

                            <!-- 输入的文本框 --->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 --->
                    <el-table-column label="序号" type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作" >
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
                </el-tab-pane>
                

                <!--- 添加静态属性面板 --->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible = true">添加属性</el-button>
                    <!--- 静态属性表格 --->
                <el-table :data="onlyTableData" border stripe>
                    <!-- 展开行 --->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 --->
                            <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{ item }}</el-tag>

                            <!-- 输入的文本框 --->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 --->
                    <el-table-column label="序号" type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作" >
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数对话框 --->
        <el-dialog
            :title="'添加' + titelText"
            :visible.sync="addDialogVisible"
            width="30%"
            @close="addDialogClosed">
            <!-- 添加参数主体 --->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titelText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数对话框 -->
        <el-dialog
            :title="'修改' + titelText"
            :visible.sync="editDialogVisible"
            width="30%"
            @close="editDialogClosed">
            <!-- 添加参数主体 --->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titelText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 商品分类列表
            cateList: [],
            // 级联选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择框双向绑定
            selectdCateKeys: [],
            activeName: 'many',
            // 动态参数数据
            manyTableData: [],
            // 静态属性的数据
            onlyTableData: [],
            // 控制添加对话框的显示
            addDialogVisible: false,
            // 添加参数的表单数据
            addForm: {
                attr_name: '',
            },
            // 添加参数的表单数据验证规则
            addFormRules: {
                attr_name: [
                    { required: true, message: '请添加参数', trigger: blur }
                ]
            },
            // 控制修改对话框的显示
            editDialogVisible: false,
            // 修改参数的表单数据
            editForm: {
                attr_name: '',
            },
            // 修改参数的表单数据验证规则
            editFormRules: {
                attr_name: [
                    { required: true, message: '请添加参数', trigger: blur }
                ]
            },
            // // 控制按钮与文本框的显示
            // inputVisible: false,
            // // 文本框输入的内容
            // inputValue: '',
            

        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList() {
            const { data: res } =  await this.$http.get('categories')

            if(res.meta.status !== 200) {
                return this.$message.error('获取数据失败！')
            }
            this.cateList = res.data
        },
        // 级联选择框变化 触发函数
        handleChange() {
            this.getParamsData()
        },
        // tab页签激活函数
        handleTabClick() {
            this.getParamsData()
        },
        // 获取数据函数
        async getParamsData() {
            if(this.selectdCateKeys.length !== 3) {
                this.selectdCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return 
            }
            
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })

            if(res.meta.status !== 200) {
                return this.$message.error('获取数据失败！')
            }
            
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                item.inputValue = ''
            })

            if(this.activeName === 'many') {
                this.manyTableData = res.data
            } else {
                this.onlyTableData = res.data
            }
        },
        // 监听添加对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮，添加参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return

                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName })

                if(res.meta.status !== 201) {
                    return this.$message.error('添加参数失败！')
                }
                this.addDialogVisible = false
                this.getParamsData()
                this.$message.success('添加参数成功！')
            })
        },
        // 点击按钮展示修改对话框
        async showEditDialog(attrId) {
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, { params: { attr_sel: this.activeName } })

            if(res.meta.status !== 200) {
                return this.$message.error('获取数据失败！')
            }

            this.editForm = res.data
            this.editDialogVisible = true
        },
        // 修改对话框关闭事件
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 提交修改信息
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if(!valid) return

                const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })

                if(res.meta.status !== 200) {
                    return this.$message.error('修改参数失败！')
                }

                this.editDialogVisible = false
                this.getParamsData()
                this.$message.success('修改参数成功！')
            })
        },
        // 根据id删除对应的参数项
        async removeParams(attrId) {
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                showConfirmButton: true,
                showCancelButton: true,
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)

            if(confirmResult !== 'confirm') {
                return this.$message.info('取消了删除')
            }
            const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
            if(res.meta.status !== 200) {
                return this.$message.error('删除参数失败！')
            }

            this.$message.success('删除参数成功！')
            // 重新获取角色列表
            this.getParamsData()
        },
        // 文本框失去焦点或按下抬起事件
        async handleInputConfirm(row) {
            if(row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有return则需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            
            // 调用函数 对attr_vals的操作，保存到数据库
            this.saveAttrVals(row)

        },
        // 对attr_vals的操作，保存到数据库
        async saveAttrVals(row) {
            // 发起请求保存参数
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, { attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals: row.attr_vals.join(' ') })

            if(res.meta.status !== 200) {
                return this.$message.error('保存参数数据失败！')
            }

            this.$message.success('保存参数数据成功！')
        },
        // 点击按钮展示文本输入框
        showInput(row) {
            row.inputVisible = true
            // 让文本框自动获得焦点
            // $nextTick当页面元素被重新渲染之后再执行这个代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus()
            })
        },
        // 删除参数可选项
        handleClose(i, row) {
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        }

    },
    computed: {
        // 按钮是否需要被禁用
        isBtnDisable() {
            if(this.selectdCateKeys.length !== 3) {
                return true
            }
            return false
        },
        // 当前选中的三级分类的id
        cateId() {
            if(this.selectdCateKeys.length === 3) {
                return this.selectdCateKeys[2]
            }
            return null
        },
        // 对话框头部标题
        titelText() {
            if(this.activeName === 'many') {
                return '动态参数'
            }
            return '静态属性'
        }

    },
}
</script>

<style lang="less" scoped>
.cat_opt {
    margin: 1em 0;
}

.el-tag {
    margin: 0.3em 0.5em;
}

.input-new-tag {
    width: 9em;
}
</style>